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本文研究了我国水驱砂岩油田的驱油效率和波及系数,主要结果是:1)极限驱油效率主要受油水粘度比和绝对渗透率影响,中国、美国、苏联的油田有较一致的相关关系;2)水驱开发结束时的油田驱油效率可直接用油水相对渗透率曲线计算的对应含水率0.98的驱油效率得出;3)水驱砂岩油田开发过程按驱油效率和波及系数随含水率的变化可分为两个阶段:含水率0.7—0.8以前,油田以扩大波及系数为主,含水率0.7—0.8以后,驱油效率上升幅度较大,其上升规律受变异系数影响;4)厚度波及系数随含水率的变化是一个先快后慢的过程,小层水淹时达到最大值。油层有效厚度越大,厚度波及系数越小;5)加密井网、细分层系是注水开发有效的调整措施。它的层系划分的原则应是使层段内所有小层的渗透率都高于吸水界限渗透率、层段变异系数小于0.5和完善小层内的注采井网;6)根据25个油田的统计,我国水驱砂岩油田在水驱开发结束时平均采收率0.367,平均驱油效率0.531,平均小层平面波及系数0.9,平均厚度波及系数0.77,平均体积波及系数0.693。
The main results are as follows: 1) The ultimate displacement efficiency is mainly affected by the oil-water viscosity ratio and the absolute permeability, and there is a consistent correlation between oilfields in China, the United States and the Soviet Union ; 2) The oil displacement efficiency at the end of water flooding can be directly obtained from the displacement efficiency of 0.98 corresponding to the water cut calculated from the relative permeability curve of oil-water; 3) The development process of water- The change of moisture content can be divided into two stages: Before the water content is 0.7-0.8, the oil field is dominated by the expansion wave coefficient. After the water content is 0.7-0.8, the displacement efficiency increases greatly, and its rising rule is affected by the variation coefficient. 4 Thickness of the sweep coefficient with the change of water content is a fast first and slow process, when the submerged reach the maximum value. The larger the effective thickness of the oil layer, the smaller the thickness of the wave propagation coefficient; 5) Encrypted well pattern, sub-layer system is an effective adjustment measures for water injection development. Its stratigraphic division should be based on the principle that the permeability of all the small layers in the interval should be higher than the permeability limit, the coefficient of variation in the interval is less than 0.5 and the perfection of the injection and recovery well patterns in the small interval; 6) , The average recovery factor 0.367 at the end of water flooding development in our country, the average flooding efficiency is 0.531, the average small plane wave is 0.9, the average thickness is 0.77, the average volume is 0.693.